Question

Hi I have a class called ColorChooser (in the net.java.dev.colorchooser.ColorChooser package)

This is a custom component used to select colors. What I want is to display a JTable with ColorChoosers in the second column. So I created my own TableCellRenderer and it works:

@SuppressWarnings("serial")
class ColorChooserTableRenderer extends DefaultTableCellRenderer {

    public static List<ColorChooser> colors;

    public ColorChooserTableRenderer(int rows) {
        colors = new ArrayList<ColorChooser>(rows);
        for (int i = 0; i<rows ; i ++) {
            colors.add(new ColorChooser());
        }
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value,
            boolean isSelected, boolean hasFocus, int row, int column) {
        return colors.get(row);
    }

}

I register this in my table :

JTable t = new JTable(5,3);
t.getColumn(t.getColumnName(1)).setCellRenderer(new ColorChooserTableRenderer(5));

The display is good. It even displays the tool tip of the ColorChoosers when i hover my mouse over one of them. The problem is that the ColorChoosers do not receive MouseEvents.

Normally when you press and hold the mouse on a ColorChooser, you get a pop up window that you can use to select a color. When in the JTable the ColorChooser component does not receive the mouse event.

Any solutions?

Edit: The question can be easily modified to this:

Can you please give me a small example of a table containing JButtons in the second column that actually work? You know, buttons that can be pressed?

Answer 1

A renderer only paints the component on the screen and does not allow for interaction. What you need is to also implement a TableCellEditor. It is recommend that you inherit the AbstractCellEditor and you’ll save some work. Check out the java tutorial for tables.

Example:

public class MyTableCellRenderer implements TableCellRenderer
{
    private JButton button = new JButton("Press Me");
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        return button;
    }
}

public class MyTableCellEditor extends AbstractCellEditor implements TableCellEditor
{
    private JButton button;

    public MyTableCellEditor()
    {
        button = new JButton("Press Me");
        button.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent e) {
                System.out.println("buttonPressed");
            }
        });
    }
    public Object getCellEditorValue() {
        return null;
    }
    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
        return button;
    }
}